states. >> as joe biden likes to break, bin laden is dead and detroit is alive. >> i've met workers in detroit and toledo who feared they'd never build another american car, and today they can't build them fast enough because we reinvented a dying auto industry that's back on top of the world. >> looking forward, the president favors keeping education and green energy programs, keeping medicare like it is, and he wants the rich to pay more for that. >> i never said this journey would be easy, and i won't promise that now. yes our path is harder, but it leads to a better place. yes, our road is longer, but we travel it together. we don't turn back. we leave no one behind. >> i've done well, he said, and i need to do more. i'm steve handelsman, nbc news at the dnc in charlotte. >>> well, elsewhere a 21-year-old charlotte man has been arrested by the secret service for allegedly posting threats to kill president obama on twitter. authorities say donte jamar sims was detained wednesday after posting messages including one on wednesday threatening to, quote, assassinate president obama t